root/gsdl/trunk/perllib/plugins/HTMLPlugin.pm @ 16836

Revision 16836, 52.0 KB (checked in by ak19, 11 years ago)

1. When working out the web_url, it needs to know of any containing directories. These directories may have directory dots in them. These dots are now first evaluated before creating the web_url. This is definitely necessary on Linux. 2. Minor bugfix in eval_dir_dots subroutine so that it does not do a filecat when there is no directory.

  • Property svn:executable set to *
  • Property svn:keywords set to Author Date Id Revision
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1###########################################################################
2#
3# HTMLPlugin.pm -- basic html plugin
4#
5# A component of the Greenstone digital library software
6# from the New Zealand Digital Library Project at the
7# University of Waikato, New Zealand.
8#
9# Copyright (C) 1999 New Zealand Digital Library Project
10#
11# This program is free software; you can redistribute it and/or modify
12# it under the terms of the GNU General Public License as published by
13# the Free Software Foundation; either version 2 of the License, or
14# (at your option) any later version.
15#
16# This program is distributed in the hope that it will be useful,
17# but WITHOUT ANY WARRANTY; without even the implied warranty of
18# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
19# GNU General Public License for more details.
20#
21# You should have received a copy of the GNU General Public License
22# along with this program; if not, write to the Free Software
23# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24#
25###########################################################################
26
27#
28# Note that this plugin handles frames only in a very simple way
29# i.e. each frame is treated as a separate document. This means
30# search results will contain links to individual frames rather
31# than linking to the top level frameset.
32# There may also be some problems caused by the _parent target
33# (it's removed by this plugin)
34#
35
36package HTMLPlugin;
37
38use ReadTextFile;
39use HBPlugin;
40use ghtml;
41use unicode;
42use util;
43use XMLParser;
44
45use Image::Size;
46use File::Copy;
47
48sub BEGIN {
49    @HTMLPlugin::ISA = ('ReadTextFile', 'HBPlugin');
50}
51
52use strict; # every perl program should have this!
53no strict 'refs'; # make an exception so we can use variables as filehandles
54
55my $arguments =
56    [ { 'name' => "process_exp",
57    'desc' => "{BasePlugin.process_exp}",
58    'type' => "regexp",
59    'deft' =>  &get_default_process_exp() },
60      { 'name' => "block_exp",
61    'desc' => "{BasePlugin.block_exp}",
62    'type' => 'regexp',
63    'deft' =>  &get_default_block_exp() },
64      { 'name' => "nolinks",
65    'desc' => "{HTMLPlugin.nolinks}",
66    'type' => "flag" },
67      { 'name' => "keep_head",
68    'desc' => "{HTMLPlugin.keep_head}",
69    'type' => "flag" },
70      { 'name' => "no_metadata",
71    'desc' => "{HTMLPlugin.no_metadata}",
72    'type' => "flag" },
73      { 'name' => "metadata_fields",
74    'desc' => "{HTMLPlugin.metadata_fields}",
75    'type' => "string",
76    'deft' => "Title" },
77      { 'name' => "hunt_creator_metadata",
78    'desc' => "{HTMLPlugin.hunt_creator_metadata}",
79    'type' => "flag" },
80      { 'name' => "file_is_url",
81    'desc' => "{HTMLPlugin.file_is_url}",
82    'type' => "flag" },
83      { 'name' => "assoc_files",
84    'desc' => "{HTMLPlugin.assoc_files}",
85    'type' => "regexp",
86    'deft' => &get_default_block_exp() },
87      { 'name' => "rename_assoc_files",
88    'desc' => "{HTMLPlugin.rename_assoc_files}",
89    'type' => "flag" },
90      { 'name' => "title_sub",
91    'desc' => "{HTMLPlugin.title_sub}",
92    'type' => "string",
93    'deft' => "" },
94      { 'name' => "description_tags",
95    'desc' => "{HTMLPlugin.description_tags}",
96    'type' => "flag" },
97      # retain this for backward compatibility (w3mir option was replaced by
98      # file_is_url)
99      { 'name' => "w3mir",
100#   'desc' => "{HTMLPlugin.w3mir}",
101    'type' => "flag",
102    'hiddengli' => "yes"},
103      { 'name' => "no_strip_metadata_html",
104    'desc' => "{HTMLPlugin.no_strip_metadata_html}",
105    'type' => "string",
106    'deft' => "",
107    'reqd' => "no"},
108      { 'name' => "sectionalise_using_h_tags",
109    'desc' => "{HTMLPlugin.sectionalise_using_h_tags}",
110    'type' => "flag" },
111      { 'name' => "use_realistic_book",
112        'desc' => "{HTMLPlugin.tidy_html}",
113    'type' => "flag"},
114      { 'name' => "old_style_HDL",
115        'desc' => "{HTMLPlugin.old_style_HDL}",
116    'type' => "flag"}
117      ];
118
119my $options = { 'name'     => "HTMLPlugin",
120        'desc'     => "{HTMLPlugin.desc}",
121        'abstract' => "no",
122        'inherits' => "yes",
123        'args'     => $arguments };
124
125
126sub HB_read_html_file {
127    my $self = shift (@_);
128    my ($htmlfile, $text) = @_;
129   
130    # load in the file
131    if (!open (FILE, $htmlfile)) {
132    print STDERR "ERROR - could not open $htmlfile\n";
133    return;
134    }
135
136    my $foundbody = 0;
137    $self->HB_gettext (\$foundbody, $text, "FILE");
138    close FILE;
139   
140    # just in case there was no <body> tag
141    if (!$foundbody) {
142    $foundbody = 1;
143    open (FILE, $htmlfile) || return;
144    $self->HB_gettext (\$foundbody, $text, "FILE");
145    close FILE;
146    }
147    # text is in utf8
148}       
149
150# converts the text to utf8, as ghtml does that for &eacute; etc.
151sub HB_gettext {
152    my $self = shift (@_);
153    my ($foundbody, $text, $handle) = @_;
154   
155    my $line = "";
156    while (defined ($line = <$handle>)) {
157    # look for body tag
158    if (!$$foundbody) {
159        if ($line =~ s/^.*<body[^>]*>//i) {
160        $$foundbody = 1;
161        } else {
162        next;
163        }
164    }
165   
166    # check for symbol fonts
167    if ($line =~ m/<font [^>]*?face\s*=\s*\"?(\w+)\"?/i) {
168        my $font = $1;
169        print STDERR "HBPlug::HB_gettext - warning removed font $font\n"
170        if ($font !~ m/^arial$/i);
171    }
172
173    $$text .= $line;
174    }
175
176    if ($self->{'input_encoding'} eq "iso_8859_1") {
177    # convert to utf-8
178    $$text=&unicode::unicode2utf8(&unicode::convert2unicode("iso_8859_1", $text));
179    }
180    # convert any alphanumeric character entities to their utf-8
181    # equivalent for indexing purposes
182    #&ghtml::convertcharentities ($$text);
183
184    $$text =~ s/\s+/ /g; # remove \n's
185}
186
187sub HB_clean_section {
188    my $self = shift (@_);
189    my ($section) = @_;
190
191    # remove tags without a starting tag from the section
192    my ($tag, $tagstart);
193    while ($section =~ m/<\/([^>]{1,10})>/) {
194    $tag = $1;
195    $tagstart = index($section, "<$tag");
196    last if (($tagstart >= 0) && ($tagstart < index($section, "<\/$tag")));
197    $section =~ s/<\/$tag>//;
198    }
199   
200    # remove extra paragraph tags
201    while ($section =~ s/<p\b[^>]*>\s*<p\b/<p/ig) {}
202   
203    # remove extra stuff at the end of the section
204    while ($section =~ s/(<u>|<i>|<b>|<p\b[^>]*>|&nbsp;|\s)$//i) {}
205   
206    # add a newline at the beginning of each paragraph
207    $section =~ s/(.)\s*<p\b/$1\n\n<p/gi;
208   
209    # add a newline every 80 characters at a word boundary
210    # Note: this regular expression puts a line feed before
211    # the last word in each section, even when it is not
212    # needed.
213    $section =~ s/(.{1,80})\s/$1\n/g;
214   
215    # fix up the image links
216    $section =~ s/<img[^>]*?src=\"?([^\">]+)\"?[^>]*>/
217    <center><img src=\"$1\" \/><\/center><br\/>/ig;
218    $section =~ s/&lt;&lt;I&gt;&gt;\s*([^\.]+\.(png|jpg|gif))/
219    <center><img src=\"$1\" \/><\/center><br\/>/ig;
220
221    return $section;
222}
223
224# Will convert the oldHDL format to the new HDL format (using the Section tag) 
225sub convert_to_newHDLformat
226{
227    my $self = shift (@_);
228    my ($file,$cnfile) = @_;
229    my $input_filename = $file;
230    my $tmp_filename = $cnfile;
231   
232    # write HTML tmp file with new HDL format
233    open (PROD, ">$tmp_filename") || die("Error Writing to File: $tmp_filename $!");
234   
235    # read in the file and do basic html cleaning (removing header etc)
236    my $html = "";
237    $self->HB_read_html_file ($input_filename, \$html);
238   
239    # process the file one section at a time
240    my $curtoclevel = 1;
241    my $firstsection = 1;
242    my $toclevel = 0;
243    while (length ($html) > 0) {
244    if ($html =~ s/^.*?(?:<p\b[^>]*>)?((<b>|<i>|<u>|\s)*)&lt;&lt;TOC(\d+)&gt;&gt;\s*(.*?)<p\b/<p/i) {
245        $toclevel = $3;
246        my $title = $4;
247        my $sectiontext = "";
248        if ($html =~ s/^(.*?)((?:<p\b[^>]*>)?((<b>|<i>|<u>|\s)*)&lt;&lt;TOC\d+&gt;&gt;)/$2/i) {
249        $sectiontext = $1;
250        } else {
251        $sectiontext = $html;
252        $html = "";
253        }
254
255        # remove tags and extra spaces from the title
256        $title =~ s/<\/?[^>]+>//g;
257        $title =~ s/^\s+|\s+$//g;
258
259        # close any sections below the current level and
260        # create a new section (special case for the firstsection)
261        print PROD "<!--\n";
262        while (($curtoclevel > $toclevel) ||
263           (!$firstsection && $curtoclevel == $toclevel)) {
264        $curtoclevel--;
265        print PROD "</Section>\n";
266        }
267        if ($curtoclevel+1 < $toclevel) {
268        print STDERR "WARNING - jump in toc levels in $input_filename " .
269            "from $curtoclevel to $toclevel\n";
270        }
271        while ($curtoclevel < $toclevel) {
272        $curtoclevel++;
273        }
274
275        if ($curtoclevel == 1) {
276            # add the header tag
277        print PROD "-->\n";
278            print PROD "<HTML>\n<HEAD>\n<TITLE>$title</TITLE>\n</HEAD>\n<BODY>\n";
279        print PROD "<!--\n";
280        }
281       
282        print PROD "<Section>\n\t<Description>\n\t\t<Metadata name=\"Title\">$title</Metadata>\n\t</Description>\n";
283       
284        print PROD "-->\n";
285       
286        # clean up the section html
287        $sectiontext = $self->HB_clean_section($sectiontext);
288
289        print PROD "$sectiontext\n";     
290
291    } else {
292        print STDERR "WARNING - leftover text\n" , $self->shorten($html),
293        "\nin $input_filename\n";
294        last;
295    }
296    $firstsection = 0;
297    }
298   
299    print PROD "<!--\n";
300    while ($curtoclevel > 0) {
301    $curtoclevel--;
302    print PROD "</Section>\n";
303    }
304    print PROD "-->\n";
305   
306    close (PROD) || die("Error Closing File: $tmp_filename $!");
307   
308    return $tmp_filename;
309}       
310
311sub shorten {
312    my $self = shift (@_);
313    my ($text) = @_;
314
315    return "\"$text\"" if (length($text) < 100);
316
317    return "\"" . substr ($text, 0, 50) . "\" ... \"" .
318    substr ($text, length($text)-50) . "\"";
319}
320
321sub convert_tidy_or_oldHDL_file
322{
323    my $self = shift (@_);
324    my ($file) = @_;
325    my $input_filename = $file;
326   
327    if (-d $input_filename)
328    {
329        return $input_filename;
330    }
331   
332    # get the input filename
333    my ($tailname, $dirname, $suffix) = &File::Basename::fileparse($input_filename, "\\.[^\\.]+\$");
334    my $base_dirname = $dirname;
335    $suffix = lc($suffix);   
336   
337    # derive tmp filename from input filename
338    # Remove any white space from filename -- no risk of name collision, and
339    # makes later conversion by utils simpler. Leave spaces in path...
340    # tidy up the filename with space, dot, hyphen between
341    $tailname =~ s/\s+//g;
342    $tailname =~ s/\.+//g;
343    $tailname =~ s/\-+//g;
344    # convert to utf-8 otherwise we have problems with the doc.xml file
345    # later on
346    &unicode::ensure_utf8(\$tailname);
347   
348    # softlink to collection tmp dir
349    my $tmp_dirname = &util::filename_cat($ENV{'GSDLCOLLECTDIR'}, "tidytmp");
350    &util::mk_dir($tmp_dirname) if (!-e $tmp_dirname);
351   
352    my $test_dirname = "";
353    my $f_separator = &util::get_os_dirsep();
354   
355    if ($dirname =~ m/import$f_separator/)
356    {
357        $test_dirname = $'; #'
358   
359    #print STDERR "init $'\n";
360   
361    while ($test_dirname =~ m/[$f_separator]/)
362    {
363        my $folderdirname = $`;
364        $tmp_dirname = &util::filename_cat($tmp_dirname,$folderdirname);
365        &util::mk_dir($tmp_dirname) if (!-e $tmp_dirname);
366        $test_dirname = $'; #'
367    }
368    }
369   
370    my $tmp_filename = &util::filename_cat($tmp_dirname, "$tailname$suffix");
371   
372    # tidy or convert the input file if it is a HTML-like file or it is accepted by the process_exp
373    if (($suffix eq ".htm") || ($suffix eq ".html") || ($suffix eq ".shtml"))
374    {   
375        #convert the input file to a new style HDL
376        my $hdl_output_filename = $input_filename;
377        if ($self->{'old_style_HDL'})
378        {
379        $hdl_output_filename = &util::filename_cat($tmp_dirname, "$tailname$suffix");
380        $hdl_output_filename = $self->convert_to_newHDLformat($input_filename,$hdl_output_filename);
381        }
382   
383    #just for checking copy all other file from the base dir to tmp dir if it is not exists
384    opendir(DIR,$base_dirname) or die "Can't open base directory : $base_dirname!";
385    my @files = grep {!/^\.+$/} readdir(DIR);
386    close(DIR);
387
388    foreach my $file (@files)
389    {
390        my $src_file = &util::filename_cat($base_dirname,$file);
391        my $dest_file = &util::filename_cat($tmp_dirname,$file);
392        if ((!-e $dest_file) && (!-d $src_file))
393        {
394        # just copy the original file back to the tmp directory
395        copy($src_file,$dest_file) or die "Can't copy file $src_file to $dest_file $!";
396        }
397    }
398   
399    # tidy the input file
400    my $tidy_output_filename = $hdl_output_filename;
401    if ($self->{'tidy_html'})
402    {
403        $tidy_output_filename = &util::filename_cat($tmp_dirname, "$tailname$suffix");
404        $tidy_output_filename = $self->tmp_tidy_file($hdl_output_filename,$tidy_output_filename);
405    }
406    $tmp_filename = $tidy_output_filename;
407    }
408    else
409    {
410        if (!-e $tmp_filename)
411    {
412        # just copy the original file back to the tmp directory
413        copy($input_filename,$tmp_filename) or die "Can't copy file $input_filename to $tmp_filename $!";
414    }
415    }
416   
417    return $tmp_filename;
418}
419
420
421# Will make the html input file as a proper XML file with removed font tag and
422# image size added to the img tag.
423# The tidying process takes place in a collection specific 'tmp' directory so
424# that we don't accidentally damage the input.
425sub tmp_tidy_file
426{
427    my $self = shift (@_);
428    my ($file,$cnfile) = @_;
429    my $input_filename = $file;
430    my $tmp_filename = $cnfile;
431   
432    # get the input filename
433    my ($tailname, $dirname, $suffix) = &File::Basename::fileparse($input_filename, "\\.[^\\.]+\$");
434
435    require HTML::TokeParser::Simple;
436   
437    # create HTML parser to decode the input file
438    my $parser = HTML::TokeParser::Simple->new($input_filename);
439
440    # write HTML tmp file without the font tag and image size are added to the img tag
441    open (PROD, ">$tmp_filename") || die("Error Writing to File: $tmp_filename $!");
442    while (my $token = $parser->get_token())
443    {
444    # is it an img tag
445    if ($token->is_start_tag('img'))
446    {
447        # get the attributes
448        my $attr = $token->return_attr;
449
450        # get the full path to the image
451        my $img_file = &util::filename_cat($dirname,$attr->{src});
452       
453        # set the width and height attribute
454        ($attr->{width}, $attr->{height}) = imgsize($img_file);
455
456        # recreate the tag
457        print PROD "<img";
458        print PROD map { qq { $_="$attr->{$_}"} } keys %$attr;
459        print PROD ">";
460    }
461    # is it a font tag
462    else
463    {
464        if (($token->is_start_tag('font')) || ($token->is_end_tag('font')))
465        {
466        # remove font tag
467        print PROD "";
468        }
469        else
470        {
471        # print without changes
472        print PROD $token->as_is;
473        }
474    }
475    }
476    close (PROD) || die("Error Closing File: $tmp_filename $!");
477
478    # run html-tidy on the tmp file to make it a proper XML file
479    my $tidyfile = `tidy -utf8 -wrap 0 -asxml $tmp_filename`;
480
481    # write result back to the tmp file
482    open (PROD, ">$tmp_filename") || die("Error Writing to File: $tmp_filename $!");
483    print PROD $tidyfile;
484    close (PROD) || die("Error Closing File: $tmp_filename $!");
485   
486    # return the output filename
487    return $tmp_filename;
488}
489
490sub read_into_doc_obj
491{
492    my $self = shift (@_); 
493    my ($pluginfo, $base_dir, $file, $block_hash, $metadata, $processor, $maxdocs, $total_count, $gli) = @_;
494       
495    # get the input file
496    my $input_filename = $file;
497    my ($tailname, $dirname, $suffix) = &File::Basename::fileparse($input_filename, "\\.[^\\.]+\$");
498    $suffix = lc($suffix);   
499   
500    if (($self->{'tidy_html'}) || ($self->{'old_style_HDL'}))
501    {
502    # because the document has to be sectionalized set the description tags
503    $self->{'description_tags'} = 1;
504   
505    # set the file to be tidied
506    $input_filename = &util::filename_cat($base_dir,$file) if $base_dir =~ m/\w/;
507   
508    # get the tidied file
509    #my $tidy_filename = $self->tmp_tidy_file($input_filename);
510    my $tidy_filename = $self->convert_tidy_or_oldHDL_file($input_filename);
511   
512    # derive tmp filename from input filename
513    my ($tailname, $dirname, $suffix) = &File::Basename::fileparse($tidy_filename, "\\.[^\\.]+\$");
514   
515    # set the new input file and base_dir to be from the tidied file
516    $file = "$tailname$suffix";
517    $base_dir = $dirname;
518    }
519   
520    # call the parent read_into_doc_obj
521    my ($process_status,$doc_obj) = $self->SUPER::read_into_doc_obj($pluginfo, $base_dir, $file, $block_hash, $metadata, $processor, $maxdocs, $total_count, $gli);
522   
523    return ($process_status,$doc_obj);
524}
525
526sub new {
527    my ($class) = shift (@_);
528    my ($pluginlist,$inputargs,$hashArgOptLists) = @_;
529    push(@$pluginlist, $class);
530   
531    push(@{$hashArgOptLists->{"ArgList"}},@{$arguments});
532    push(@{$hashArgOptLists->{"OptList"}},$options);
533   
534
535    my $self = new ReadTextFile($pluginlist,$inputargs,$hashArgOptLists);
536   
537    if ($self->{'w3mir'}) {
538    $self->{'file_is_url'} = 1;
539    }
540    $self->{'aux_files'} = {};
541    $self->{'dir_num'} = 0;
542    $self->{'file_num'} = 0;
543   
544    return bless $self, $class;
545}
546
547# may want to use (?i)\.(gif|jpe?g|jpe|png|css|js(?:@.*)?)$
548# if have eg <script language="javascript" src="img/lib.js@123">
549sub get_default_block_exp {
550    my $self = shift (@_);
551   
552    #return q^(?i)\.(gif|jpe?g|jpe|jpg|png|css)$^;
553    return "";
554}
555
556sub get_default_process_exp {
557    my $self = shift (@_);
558   
559    # the last option is an attempt to encode the concept of an html query ...
560    return q^(?i)(\.html?|\.shtml|\.shm|\.asp|\.php\d?|\.cgi|.+\?.+=.*)$^;
561}
562
563sub store_block_files
564{
565    my $self =shift (@_);
566    my ($filename_full_path, $block_hash) = @_;
567
568    my $html_fname = $filename_full_path;
569    my @file_blocks;
570   
571    my ($language, $encoding) = $self->textcat_get_language_encoding ($filename_full_path);
572
573    # read in file ($text will be in utf8)
574    my $raw_text = "";
575    $self->read_file_no_decoding ($filename_full_path, \$raw_text);
576
577    my $textref = \$raw_text;
578    my $opencom = '(?:<!--|&lt;!(?:&mdash;|&#151;|--))';
579    my $closecom = '(?:-->|(?:&mdash;|&#151;|--)&gt;)';
580    $$textref =~ s/$opencom(.*?)$closecom//gs;
581
582    my $attval = "\\\"[^\\\"]+\\\"|[^\\s>]+";
583    my @img_matches = ($$textref =~ m/<img[^>]*?src\s*=\s*($attval)[^>]*>/igs);
584    my @usemap_matches = ($$textref =~ m/<img[^>]*?usemap\s*=\s*($attval)[^>]*>/igs);
585    my @link_matches = ($$textref =~ m/<link[^>]*?href\s*=\s*($attval)[^>]*>/igs);
586    my @embed_matches = ($$textref =~ m/<embed[^>]*?src\s*=\s*($attval)[^>]*>/igs);
587    my @tabbg_matches = ($$textref =~ m/<(?:table|tr|td)[^>]*?background\s*=\s*($attval)[^>]*>/igs);
588    my @script_matches = ($$textref =~ m/<script[^>]*?src\s*=\s*($attval)[^>]*>/igs);
589
590    if(!defined $self->{'utf8_to_original_filename'}) {
591    # maps from utf8 converted link name -> original filename referrred to by (possibly URL-encoded) src url
592    $self->{'utf8_to_original_filename'} = {};
593    }
594
595    foreach my $link (@img_matches, @usemap_matches, @link_matches, @embed_matches, @tabbg_matches, @script_matches) {
596
597    # remove quotes from link at start and end if necessary
598    if ($link=~/^\"/) {
599        $link=~s/^\"//;
600        $link=~s/\"$//;
601    }
602
603    $link =~ s/\#.*$//s; # remove any anchor names, e.g. foo.html#name becomes foo.html
604    # some links may just be anchor names
605    next unless ($link =~ /\S+/);
606
607    if ($link !~ m@^/@ && $link !~ m/^([A-Z]:?)\\/) {
608        # Turn relative file path into full path
609        my $dirname = &File::Basename::dirname($filename_full_path);
610        $link = &util::filename_cat($dirname, $link);
611    }
612    $link = $self->eval_dir_dots($link);
613   
614
615    # this is the actual filename on the filesystem (that the link refers to)
616    my $url_original_filename = $self->opt_url_decode($link);
617
618    # Convert the url_original_filename into its utf8 version. Store the utf8 link along with the url_original_filename
619    my $utf8_link = "";
620    $self->decode_text($link,$encoding,$language,\$utf8_link);
621### my $utf8_url_encoded_link = &unicode::url_encode($utf8_link);
622
623    $self->{'utf8_to_original_filename'}->{$utf8_link} = $url_original_filename;
624### $self->{'utf8_to_original_filename'}->{$utf8_url_encoded_link} = $url_original_filename;
625
626#   print STDERR "**** Storing block link: $link\n";
627#   print STDERR "**** URL original filename: $url_original_filename\n";
628    print STDERR "**** utf8_encoded_link to original src filename:\n\t$utf8_link\n\t".$self->{'utf8_to_original_filename'}->{$utf8_link}."\n";
629
630    $block_hash->{'file_blocks'}->{$url_original_filename} = 1;
631    }
632}
633
634# Given a filename in any encoding, will URL decode it to get back the original filename
635# in the original encoding. Because this method is intended to work out the *original*
636# filename*, it not URL decode any filename if a file by the name of the *URL-encoded*
637# string already exists in the local folder.
638# Return the original filename corresponding to the parameter URL-encoded filename, and
639# a decoded flag that is set to true iff URL-decoding had to be applied.
640sub opt_url_decode {
641    my $self = shift (@_);
642    my ($link) = @_;
643
644    # Replace %XX's in URL with decoded value if required.
645    # Note that the filename may include the %XX in some situations
646    if ($link =~ m/\%[A-F0-9]{2}/i) {
647    if (!-e $link) {
648        $link = &unicode::url_decode($link);
649    }
650    }
651
652    return $link;
653}
654
655
656# do plugin specific processing of doc_obj
657sub process {
658    my $self = shift (@_);
659    my ($textref, $pluginfo, $base_dir, $file, $metadata, $doc_obj, $gli) = @_;
660    my $outhandle = $self->{'outhandle'};
661
662    if ($ENV{'GSDLOS'} =~ m/^windows/i) {
663    # this makes life so much easier... perl can cope with unix-style '/'s.
664    $base_dir =~ s@(\\)+@/@g;
665    $file =~ s@(\\)+@/@g;
666    }
667   
668    # reset per-doc stuff...
669    $self->{'aux_files'} = {};
670    $self->{'dir_num'} = 0;
671    $self->{'file_num'} = 0;
672
673    # process an HTML file where sections are divided by headings tags (H1, H2 ...)
674    # you can also include metadata in the format (X can be any number)
675    # <hX>Title<!--gsdl-metadata
676    #   <Metadata name="name1">value1</Metadata>
677    #   ...
678    #   <Metadata name="nameN">valueN</Metadata>
679    #--></hX>
680    if ($self->{'sectionalise_using_h_tags'}) {
681    # description_tags should allways be activated because we convert headings to description tags
682    $self->{'description_tags'} = 1;
683
684    my $arrSections = [];
685    $$textref =~ s/<h([0-9]+)[^>]*>(.*?)<\/h[0-9]+>/$self->process_heading($1, $2, $arrSections, $file)/isge;
686
687    if (scalar(@$arrSections)) {
688        my $strMetadata = $self->update_section_data($arrSections, -1);
689        if (length($strMetadata)) {
690        $strMetadata = '<!--' . $strMetadata . "\n-->\n</body>";
691        $$textref =~ s/<\/body>/$strMetadata/ig;
692        }
693    }
694    }
695
696    my $cursection = $doc_obj->get_top_section();
697
698    $self->extract_metadata ($textref, $metadata, $doc_obj, $cursection)
699    unless $self->{'no_metadata'} || $self->{'description_tags'};
700
701    # Store URL for page as metadata - this can be used for an
702    # altavista style search interface. The URL won't be valid
703    # unless the file structure contains the domain name (i.e.
704    # like when w3mir is used to download a website).
705
706    # URL metadata (even invalid ones) are used to support internal
707    # links, so even if 'file_is_url' is off, still need to store info
708
709#    print STDERR "#### file: $file\n";
710
711    my ($tailname,$dirname,$suffix) = &File::Basename::fileparse($file, "\\.[^\\.]+\$");
712    my $utf8_file = $self->filename_to_utf8_metadata($file);
713    my $web_url = "http://";
714    if(defined $dirname) { # local directory
715    $dirname = $self->eval_dir_dots($dirname);
716    $web_url = $web_url.$dirname.$utf8_file;
717    } else {
718    $web_url = $web_url.$utf8_file;
719    }
720#    print STDERR "#### weburl: $web_url\n";
721
722    $doc_obj->add_utf8_metadata($cursection, "URL", $web_url);
723
724    if ($self->{'file_is_url'}) {
725    $doc_obj->add_metadata($cursection, "weblink", "<a href=\"$web_url\">");
726    $doc_obj->add_metadata($cursection, "webicon", "_iconworld_");
727    $doc_obj->add_metadata($cursection, "/weblink", "</a>");
728    }
729
730    if ($self->{'description_tags'}) {
731    # remove the html header - note that doing this here means any
732    # sections defined within the header will be lost (so all <Section>
733    # tags must appear within the body of the HTML)
734    my ($head_keep) = ($$textref =~ m/^(.*?)<body[^>]*>/is);
735
736    $$textref =~ s/^.*?<body[^>]*>//is;
737    $$textref =~ s/(<\/body[^>]*>|<\/html[^>]*>)//isg;
738
739    my $opencom = '(?:<!--|&lt;!(?:&mdash;|&#151;|--))';
740    my $closecom = '(?:-->|(?:&mdash;|&#151;|--)&gt;)';
741
742    my $lt = '(?:<|&lt;)';
743    my $gt = '(?:>|&gt;)';
744    my $quot = '(?:"|&quot;|&rdquo;|&ldquo;)';
745
746    my $dont_strip = '';
747    if ($self->{'no_strip_metadata_html'}) {
748        ($dont_strip = $self->{'no_strip_metadata_html'}) =~ s{,}{|}g;
749    }
750
751    my $found_something = 0; my $top = 1;
752    while ($$textref =~ s/^(.*?)$opencom(.*?)$closecom//s) {
753        my $text = $1;
754        my $comment = $2;
755        if (defined $text) {
756        # text before a comment - note that getting to here
757        # doesn't necessarily mean there are Section tags in
758        # the document
759        $self->process_section(\$text, $base_dir, $file, $doc_obj, $cursection);
760        }
761        while ($comment =~ s/$lt(.*?)$gt//s) {
762        my $tag = $1;
763        if ($tag eq "Section") {
764            $found_something = 1;
765            $cursection = $doc_obj->insert_section($doc_obj->get_end_child($cursection)) unless $top;
766            $top = 0;
767        } elsif ($tag eq "/Section") {
768            $found_something = 1;
769            $cursection = $doc_obj->get_parent_section ($cursection);
770        } elsif ($tag =~ m/^Metadata name=$quot(.*?)$quot/s) {
771            my $metaname = $1;
772            my $accumulate = $tag =~ m/mode=${quot}accumulate${quot}/ ? 1 : 0;
773            $comment =~ s/^(.*?)$lt\/Metadata$gt//s;
774            my $metavalue = $1;
775            $metavalue =~ s/^\s+//;
776            $metavalue =~ s/\s+$//;
777                    # assume that no metadata value intentionally includes
778                    # carriage returns or HTML tags (if they're there they
779                    # were probably introduced when converting to HTML from
780                    # some other format).
781            # actually some people want to have html tags in their
782            # metadata.
783            $metavalue =~ s/[\cJ\cM]/ /sg;
784            $metavalue =~ s/<[^>]+>//sg
785            unless $dont_strip && ($dont_strip eq 'all' || $metaname =~ m/^($dont_strip)$/);
786            $metavalue =~ s/\s+/ /sg;
787            if ($accumulate) {
788            $doc_obj->add_utf8_metadata($cursection, $metaname, $metavalue);
789            } else {
790            $doc_obj->set_utf8_metadata_element($cursection, $metaname, $metavalue);   
791            }
792        } elsif ($tag eq "Description" || $tag eq "/Description") {
793            # do nothing with containing Description tags
794        } else {
795            # simple HTML tag (probably created by the conversion
796            # to HTML from some other format) - we'll ignore it and
797            # hope for the best ;-)
798        }
799        }
800    }
801    if ($cursection ne "") {
802        print $outhandle "HTMLPlugin: WARNING: $file contains unmatched <Section></Section> tags\n";
803    }
804
805    $$textref =~ s/^.*?<body[^>]*>//is;
806    $$textref =~ s/(<\/body[^>]*>|<\/html[^>]*>)//isg;
807    if ($$textref =~ m/\S/) {
808        if (!$found_something) {
809        if ($self->{'verbosity'} > 2) {
810            print $outhandle "HTMLPlugin: WARNING: $file appears to contain no Section tags so\n";
811            print $outhandle "          will be processed as a single section document\n";
812        }
813
814        # go ahead and process single-section document
815        $self->process_section($textref, $base_dir, $file, $doc_obj, $cursection);
816
817        # if document contains no Section tags we'll go ahead
818        # and extract metadata (this won't have been done
819        # above as the -description_tags option prevents it)
820        my $complete_text = $head_keep.$doc_obj->get_text($cursection);
821        $self->extract_metadata (\$complete_text, $metadata, $doc_obj, $cursection)
822            unless $self->{'no_metadata'};
823
824        } else {
825        print $outhandle "HTMLPlugin: WARNING: $file contains the following text outside\n";
826        print $outhandle "          of the final closing </Section> tag. This text will\n";
827        print $outhandle "          be ignored.";
828
829        my ($text);
830        if (length($$textref) > 30) {
831            $text = substr($$textref, 0, 30) . "...";
832        } else {
833            $text = $$textref;
834        }
835        $text =~ s/\n/ /isg;
836        print $outhandle " ($text)\n";
837        }
838    } elsif (!$found_something) {
839
840        if ($self->{'verbosity'} > 2) {
841        # may get to here if document contained no valid Section
842        # tags but did contain some comments. The text will have
843        # been processed already but we should print the warning
844        # as above and extract metadata
845        print $outhandle "HTMLPlugin: WARNING: $file appears to contain no Section tags and\n";
846        print $outhandle "          is blank or empty.  Metadata will be assigned if present.\n";
847        }
848
849        my $complete_text = $head_keep.$doc_obj->get_text($cursection);
850        $self->extract_metadata (\$complete_text, $metadata, $doc_obj, $cursection)
851        unless $self->{'no_metadata'};
852    }
853   
854    } else {
855
856    # remove header and footer
857    if (!$self->{'keep_head'} || $self->{'description_tags'}) {
858        $$textref =~ s/^.*?<body[^>]*>//is;
859        $$textref =~ s/(<\/body[^>]*>|<\/html[^>]*>)//isg;
860    }
861
862    # single section document
863    $self->process_section($textref, $base_dir, $file, $doc_obj, $cursection);
864    }
865    return 1;
866}
867
868
869sub process_heading
870{
871    my ($self, $nHeadNo, $strHeadingText, $arrSections, $file) = @_;
872    $strHeadingText = '' if (!defined($strHeadingText));
873
874    my $strMetadata = $self->update_section_data($arrSections, int($nHeadNo));
875
876    my $strSecMetadata = '';
877    while ($strHeadingText =~ s/<!--gsdl-metadata(.*?)-->//is)
878    {
879    $strSecMetadata .= $1;
880    }
881
882    $strHeadingText =~ s/^\s+//g;
883    $strHeadingText =~ s/\s+$//g;
884    $strSecMetadata =~ s/^\s+//g;
885    $strSecMetadata =~ s/\s+$//g;
886
887    $strMetadata .= "\n<Section>\n\t<Description>\n\t\t<Metadata name=\"Title\">" . $strHeadingText . "</Metadata>\n";
888
889    if (length($strSecMetadata)) {
890    $strMetadata .= "\t\t" . $strSecMetadata . "\n";
891    }
892
893    $strMetadata .= "\t</Description>\n";
894
895    return "<!--" . $strMetadata . "-->";
896}
897
898
899sub update_section_data
900{
901    my ($self, $arrSections, $nCurTocNo) = @_;
902    my ($strBuffer, $nLast, $nSections) = ('', 0, scalar(@$arrSections));
903
904    if ($nSections == 0) {
905    push @$arrSections, $nCurTocNo;
906    return $strBuffer;
907    }
908    $nLast = $arrSections->[$nSections - 1];
909    if ($nCurTocNo > $nLast) {
910    push @$arrSections, $nCurTocNo;
911    return $strBuffer;
912    }
913    for(my $i = $nSections - 1; $i >= 0; $i--) {
914    if ($nCurTocNo <= $arrSections->[$i]) {
915        $strBuffer .= "\n</Section>";
916        pop @$arrSections;
917    }
918    }
919    push @$arrSections, $nCurTocNo;
920    return $strBuffer;
921}
922
923
924# note that process_section may be called multiple times for a single
925# section (relying on the fact that add_utf8_text appends the text to any
926# that may exist already).
927sub process_section {
928    my $self = shift (@_);
929    my ($textref, $base_dir, $file, $doc_obj, $cursection) = @_;
930    # trap links
931    if (!$self->{'nolinks'}) {
932    # usemap="./#index" not handled correctly => change to "#index"
933##  $$textref =~ s/(<img[^>]*?usemap\s*=\s*[\"\']?)([^\"\'>\s]+)([\"\']?[^>]*>)/
934
935    $$textref =~ s/(<img[^>]*?usemap\s*=\s*)((?:[\"][^\"]+[\"])|(?:[\'][^\']+[\'])|(?:[^\s\/>]+))([^>]*>)/
936        $self->replace_usemap_links($1, $2, $3)/isge;
937
938##  $$textref =~ s/(<(?:a|area|frame|link|script)\s+[^>]*?\s*(?:href|src)\s*=\s*[\"\']?)([^\"\'>\s]+)([\"\']?[^>]*>)/
939
940    $$textref =~ s/(<(?:a|area|frame|link|script)\s+[^>]*?\s*(?:href|src)\s*=\s*)((?:[\"][^\"]+[\"])|(?:[\'][^\']+[\'])|(?:[^\s\/>]+))([^>]*>)/
941        $self->replace_href_links ($1, $2, $3, $base_dir, $file, $doc_obj, $cursection)/isge;
942    }
943
944    # trap images
945
946    # Previously, by default, HTMLPlugin would embed <img> tags inside anchor tags
947    # i.e. <a href="image><img src="image"></a> in order to overcome a problem that
948    # turned regular text succeeding images into links. That is, by embedding <imgs>
949    # inside <a href=""></a>, the text following images were no longer misbehaving.
950    # However, there would be many occasions whereby images were not meant to link
951    # to their source images but where the images would link to another web page.
952    # To allow this, the no_image_links option was introduced: it would prevent
953    # the behaviour of embedding images into links that referenced the source images.
954
955    # Somewhere along the line, the problem of normal text turning into links when
956    # such text followed images which were not embedded in <a href=""></a> ceased
957    # to occur. This is why the following lines have been commented out (as well as
958    # two lines in replace_images). They appear to no longer apply.
959
960    # If at any time, there is a need for having images embedded in <a> anchor tags,
961    # then it might be better to turn that into an HTMLPlugin option rather than make
962    # it the default behaviour. Also, eventually, no_image_links needs to become
963    # a deprecated option for HTMLPlugin as it has now become the default behaviour.
964
965    #if(!$self->{'no_image_links'}){
966    $$textref =~ s/(<(?:img|embed|table|tr|td)[^>]*?(?:src|background)\s*=\s*)((?:[\"][^\"]+[\"])|(?:[\'][^\']+[\'])|(?:[^\s\/>]+))([^>]*>)/
967    $self->replace_images ($1, $2, $3, $base_dir, $file, $doc_obj, $cursection)/isge;
968    #}
969
970    # add text to document object
971    # turn \ into \\ so that the rest of greenstone doesn't think there
972    # is an escape code following. (Macro parsing loses them...)
973    $$textref =~ s/\\/\\\\/go;
974   
975    $doc_obj->add_utf8_text($cursection, $$textref);
976}
977
978sub replace_images {
979    my $self = shift (@_);
980    my ($front, $link, $back, $base_dir,
981    $file, $doc_obj, $section) = @_;
982
983    # remove quotes from link at start and end if necessary
984    if ($link=~/^[\"\']/) {
985    $link=~s/^[\"\']//;
986    $link=~s/[\"\']$//;
987    $front.='"';
988    $back="\"$back";
989    }
990
991    $link =~ s/\n/ /g;
992
993    # Hack to overcome Windows wv 0.7.1 bug that causes embedded images to be broken
994    # If the Word file path has spaces in it, wv messes up and you end up with
995    #   absolute paths for the images, and without the "file://" prefix
996    # So check for this special case and massage the data to be correct
997    if ($ENV{'GSDLOS'} =~ m/^windows/i && $self->{'plugin_type'} eq "WordPlug" && $link =~ m/^[A-Za-z]\:\\/) {
998    $link =~ s/^.*\\([^\\]+)$/$1/;
999    }
1000   
1001    my ($href, $hash_part, $rl) = $self->format_link ($link, $base_dir, $file);
1002
1003    my $img_file =  $self->add_file ($href, $rl, $hash_part, $base_dir, $doc_obj, $section);
1004
1005#    print STDERR "**** link = $link\n";
1006#    print STDERR "**** href = $href\n";
1007#    print STDERR "**** img_file = $img_file\n";
1008
1009    my $anchor_name = $img_file;
1010    #$anchor_name =~ s/^.*\///;
1011    #$anchor_name = "<a name=\"$anchor_name\" ></a>";
1012
1013    my $image_link = $front . $img_file .$back;
1014    return $image_link;
1015
1016    # The reasons for why the following two lines are no longer necessary can be
1017    # found in subroutine process_section
1018    #my $anchor_link = "<a href=\"$img_file\" >".$image_link."</a>"; 
1019    #return $anchor_link;   
1020   
1021    #return $front . $img_file . $back . $anchor_name;
1022}
1023
1024sub replace_href_links {
1025    my $self = shift (@_);
1026    my ($front, $link, $back, $base_dir, $file, $doc_obj, $section) = @_;
1027
1028    # remove quotes from link at start and end if necessary
1029    if ($link=~/^[\"\']/) {
1030    $link=~s/^[\"\']//;
1031    $link=~s/[\"\']$//;
1032    $front.='"';
1033    $back="\"$back";
1034    }
1035
1036    # attempt to sort out targets - frames are not handled
1037    # well in this plugin and some cases will screw things
1038    # up - e.g. the _parent target (so we'll just remove
1039    # them all ;-)
1040    $front =~ s/(target=\"?)_top(\"?)/$1_gsdltop_$2/is;
1041    $back =~ s/(target=\"?)_top(\"?)/$1_gsdltop_$2/is;
1042    $front =~ s/target=\"?_parent\"?//is;
1043    $back =~ s/target=\"?_parent\"?//is;
1044
1045    return $front . $link . $back if $link =~ m/^\#/s;
1046    $link =~ s/\n/ /g;
1047
1048    # Find file referred to by $link on file system
1049    # This is more complicated than it sounds when char encodings
1050    # is taken in to account
1051##    &unicode::ensure_utf8(\$link);
1052##    $link = &unicode::url_encode($link);
1053#    print STDERR "#### filepath: ".&util::filename_cat($base_dir,$file)."\n";
1054#    print STDERR "#### link: $link\n";
1055
1056    my ($href, $hash_part, $rl) = $self->format_link ($link, $base_dir, $file);
1057#    print STDERR "#### href: $href\n";
1058 
1059    # href may use '\'s where '/'s should be on Windows
1060    $href =~ s/\\/\//g;
1061
1062##    $href = &unicode::url_decode($href);
1063#    print STDERR "#### href again: $href\n";
1064    my ($filename) = $href =~ m/^(?:.*?):(?:\/\/)?(.*)/;
1065   
1066
1067    ##### leave all these links alone (they won't be picked up by intermediate
1068    ##### pages). I think that's safest when dealing with frames, targets etc.
1069    ##### (at least until I think of a better way to do it). Problems occur with
1070    ##### mailto links from within small frames, the intermediate page is displayed
1071    ##### within that frame and can't be seen. There is still potential for this to
1072    ##### happen even with html pages - the solution seems to be to somehow tell
1073    ##### the browser from the server side to display the page being sent (i.e.
1074    ##### the intermediate page) in the top level window - I'm not sure if that's
1075    ##### possible - the following line should probably be deleted if that can be done
1076    return $front . $link . $back if $href =~ m/^(mailto|news|gopher|nntp|telnet|javascript):/is;
1077
1078
1079    if (($rl == 0) || ($filename =~ m/$self->{'process_exp'}/) ||
1080    ($href =~ m/\/$/) || ($href =~ m/^(mailto|news|gopher|nntp|telnet|javascript):/i)) {
1081    &ghtml::urlsafe ($href);
1082    return $front . "_httpextlink_&rl=" . $rl . "&href=" . $href . $hash_part . $back;
1083    } else {
1084    # link is to some other type of file (eg image) so we'll
1085    # need to associate that file
1086    return $front . $self->add_file ($href, $rl, $hash_part, $base_dir, $doc_obj, $section) . $back;
1087    }
1088}
1089
1090sub add_file {
1091    my $self = shift (@_);
1092    my ($href, $rl, $hash_part, $base_dir, $doc_obj, $section) = @_;
1093    my ($newname);
1094
1095    my $filename = $href;
1096    if ($base_dir eq "") {
1097    # remove http:/ thereby leaving one slash at the start
1098    $filename =~ s/^[^:]*:\///;
1099    }
1100    else {
1101    # remove http://
1102    $filename =~ s/^[^:]*:\/\///;
1103    }
1104
1105    $filename = &util::filename_cat($base_dir, $filename);
1106#    print STDERR "**** filename: $filename\n";
1107    # Replace %XX's in URL with decoded value if required. Note that the filename may include the %XX in some
1108    # situations. If the *original* file's name was in URL encoding, the following method will not decode it.
1109    my $utf8_filename = $filename;
1110   
1111#    print STDERR "*** filename before URL decoding: $filename\n";
1112    $filename = $self->opt_url_decode($utf8_filename);
1113#    print STDERR "*** filename after URL decoding:  $filename\n\n";
1114
1115    # some special processing if the intended filename was converted to utf8, but
1116    # the actual file still needs to be renamed
1117    if (!-e $filename) {
1118    # try the original filename stored in map
1119    my $original_filename = $self->{'utf8_to_original_filename'}->{$filename};
1120    if (-e $original_filename) {
1121        $filename = $original_filename;
1122    }
1123    }
1124   
1125    my ($ext) = $filename =~ m/(\.[^\.]*)$/;
1126
1127    if ($rl == 0) {
1128    if ((!defined $ext) || ($ext !~ m/$self->{'assoc_files'}/)) {
1129        return "_httpextlink_&rl=0&el=prompt&href=" . $href . $hash_part;
1130    }
1131    else {
1132        return "_httpextlink_&rl=0&el=direct&href=" . $href . $hash_part;
1133    }
1134    }
1135
1136    if ((!defined $ext) || ($ext !~ m/$self->{'assoc_files'}/)) {
1137    return "_httpextlink_&rl=" . $rl . "&href=" . $href . $hash_part;
1138    }
1139    if ($self->{'rename_assoc_files'}) {
1140    if (defined $self->{'aux_files'}->{$href}) {
1141        $newname = $self->{'aux_files'}->{$href}->{'dir_num'} . "/" .
1142        $self->{'aux_files'}->{$href}->{'file_num'} . $ext;
1143    } else {
1144        $newname = $self->{'dir_num'} . "/" . $self->{'file_num'} . $ext;
1145        $self->{'aux_files'}->{$href} = {'dir_num' => $self->{'dir_num'}, 'file_num' => $self->{'file_num'}};
1146        $self->inc_filecount ();
1147    }
1148    $doc_obj->associate_file($filename, $newname, undef, $section);
1149    return "_httpdocimg_/$newname";
1150    } else {
1151    ($newname) = $utf8_filename =~ m/([^\/\\]*)$/;
1152   
1153#   print STDERR "Before url encoding newname: $newname\n";
1154    # Make sure this name uses only ASCII characters
1155    # => use URL encoding, as it preserves original encoding
1156    $newname = &unicode::url_encode($newname);
1157#   print STDERR "After url encoding newname: $newname\n";
1158#   print STDERR "*** Real name and converted filename:\n\t$filename\n\t$newname\n";
1159
1160    $doc_obj->associate_file($filename, $newname, undef, $section);
1161
1162    # Since the generated image will be URL-encoded to avoid file-system/browser mess-ups
1163    # of filenames, URL-encode the additional percent signs of the URL-encoded filename
1164    my $newname_url = $newname;
1165    $newname_url =~ s/%/%25/g;
1166    return "_httpdocimg_/$newname_url";
1167    }
1168}
1169
1170
1171sub format_link {
1172    my $self = shift (@_);
1173    my ($link, $base_dir, $file) = @_;
1174
1175    my ($before_hash, $hash_part) = $link =~ m/^([^\#]*)(\#?.*)$/;
1176   
1177    $hash_part = "" if !defined $hash_part;
1178    if (!defined $before_hash || $before_hash !~ m/[\w\.\/]/) {
1179    my $outhandle = $self->{'outhandle'};
1180    print $outhandle "HTMLPlugin: ERROR - badly formatted tag ignored ($link)\n"
1181        if $self->{'verbosity'};
1182    return ($link, "", 0);
1183    }
1184
1185    if ($before_hash =~ s@^((?:http|ftp|file)://)@@i) {
1186    my $type = $1;
1187
1188    if ($link =~ m/^(http|ftp):/i) {
1189        # Turn url (using /) into file name (possibly using \ on windows)
1190        my @http_dir_split = split('/', $before_hash);
1191        $before_hash = &util::filename_cat(@http_dir_split);
1192    }
1193
1194    $before_hash = $self->eval_dir_dots($before_hash);
1195   
1196    my $linkfilename = &util::filename_cat ($base_dir, $before_hash);
1197   
1198    my $rl = 0;
1199    $rl = 1 if (-e $linkfilename);
1200
1201    # make sure there's a slash on the end if it's a directory
1202    if ($before_hash !~ m/\/$/) {
1203        $before_hash .= "/" if (-d $linkfilename);
1204    }
1205    return ($type . $before_hash, $hash_part, $rl);
1206   
1207    } elsif ($link !~ m/^(mailto|news|gopher|nntp|telnet|javascript):/i && $link !~ m/^\//) {
1208
1209    if ($before_hash =~ s@^/@@ || $before_hash =~ m/\\/) {
1210
1211        # the first directory will be the domain name if file_is_url
1212        # to generate archives, otherwise we'll assume all files are
1213        # from the same site and base_dir is the root
1214
1215        if ($self->{'file_is_url'}) {
1216        my @dirs = split /[\/\\]/, $file;
1217        my $domname = shift (@dirs);
1218        $before_hash = &util::filename_cat($domname, $before_hash);
1219        $before_hash =~ s@\\@/@g; # for windows
1220        }
1221        else
1222        {
1223        # see if link shares directory with source document
1224        # => turn into relative link if this is so!
1225       
1226        if ($ENV{'GSDLOS'} =~ m/^windows/i) {
1227            # too difficult doing a pattern match with embedded '\'s...
1228            my $win_before_hash=$before_hash;
1229            $win_before_hash =~ s@(\\)+@/@g;
1230            # $base_dir is already similarly "converted" on windows.
1231            if ($win_before_hash =~ s@^$base_dir/@@o) {
1232            # if this is true, we removed a prefix
1233            $before_hash=$win_before_hash;
1234            }
1235        }
1236        else {
1237            # before_hash has lost leading slash by this point,
1238            # -> add back in prior to substitution with $base_dir
1239            $before_hash = "/$before_hash";
1240
1241            $before_hash = &util::filename_cat("",$before_hash);
1242            $before_hash =~ s@^$base_dir/@@;
1243        }
1244        }
1245    } else {
1246        # Turn relative file path into full path
1247        my $dirname = &File::Basename::dirname($file);
1248        $before_hash = &util::filename_cat($dirname, $before_hash);
1249        $before_hash = $self->eval_dir_dots($before_hash);             
1250       
1251#       print STDERR "#### before_hash: $before_hash\n";
1252    }
1253
1254    my $linkfilename = &util::filename_cat ($base_dir, $before_hash);
1255    # make sure there's a slash on the end if it's a directory
1256    if ($before_hash !~ m/\/$/) {
1257        $before_hash .= "/" if (-d $linkfilename);
1258    }
1259    return ("http://" . $before_hash, $hash_part, 1);
1260    } else {
1261    # mailto, news, nntp, telnet, javascript or gopher link
1262    return ($before_hash, "", 0);
1263    }
1264}
1265
1266sub extract_first_NNNN_characters {
1267    my $self = shift (@_);
1268    my ($textref, $doc_obj, $thissection) = @_;
1269   
1270    foreach my $size (split /,/, $self->{'first'}) {
1271    my $tmptext =  $$textref;
1272    # skip to the body
1273    $tmptext =~ s/.*<body[^>]*>//i;
1274    # remove javascript
1275    $tmptext =~ s@<script.*?</script>@ @sig;
1276    $tmptext =~ s/<[^>]*>/ /g;
1277    $tmptext =~ s/&nbsp;/ /g;
1278    $tmptext =~ s/^\s+//;
1279    $tmptext =~ s/\s+$//;
1280    $tmptext =~ s/\s+/ /gs;
1281    $tmptext = &unicode::substr ($tmptext, 0, $size);
1282    $tmptext =~ s/\s\S*$/&#8230;/; # adds an ellipse (...)
1283    $doc_obj->add_utf8_metadata ($thissection, "First$size", $tmptext);
1284    }
1285}
1286
1287
1288sub extract_metadata {
1289    my $self = shift (@_);
1290    my ($textref, $metadata, $doc_obj, $section) = @_;
1291    my $outhandle = $self->{'outhandle'};
1292    # if we don't want metadata, we may as well not be here ...
1293    return if (!defined $self->{'metadata_fields'});
1294
1295    # metadata fields to extract/save. 'key' is the (lowercase) name of the
1296    # html meta, 'value' is the metadata name for greenstone to use
1297    my %find_fields = ();
1298
1299    my %creator_fields = (); # short-cut for lookups
1300
1301
1302    foreach my $field (split /,/, $self->{'metadata_fields'}) {
1303        $field =~ s/^\s+//; # remove leading whitespace
1304        $field =~ s/\s+$//; # remove trailing whitespace
1305
1306    # support tag<tagname>
1307    if ($field =~ m/^(.*?)<(.*?)>$/) {
1308        # "$2" is the user's preferred gs metadata name
1309        $find_fields{lc($1)}=$2; # lc = lowercase
1310    } else { # no <tagname> for mapping
1311        # "$field" is the user's preferred gs metadata name
1312        $find_fields{lc($field)}=$field; # lc = lowercase
1313    }
1314    }
1315
1316    if (defined $self->{'hunt_creator_metadata'} &&
1317    $self->{'hunt_creator_metadata'} == 1 ) {
1318    my @extra_fields =
1319        (
1320         'author',
1321         'author.email',
1322         'creator',
1323         'dc.creator',
1324         'dc.creator.corporatename',
1325         );
1326
1327    # add the creator_metadata fields to search for
1328    foreach my $field (@extra_fields) {
1329        $creator_fields{$field}=0; # add to lookup hash
1330    }
1331    }
1332
1333
1334    # find the header in the html file, which has the meta tags
1335    $$textref =~ m@<head>(.*?)</head>@si;
1336
1337    my $html_header=$1;
1338
1339    # go through every <meta... tag defined in the html and see if it is
1340    # one of the tags we want to match.
1341   
1342    # special case for title - we want to remember if its been found
1343    my $found_title = 0;
1344    # this assumes that ">" won't appear. (I don't think it's allowed to...)
1345    $html_header =~ m/^/; # match the start of the string, for \G assertion
1346   
1347    while ($html_header =~ m/\G.*?<meta(.*?)>/sig) {
1348    my $metatag=$1;
1349    my ($tag, $value);
1350
1351    # find the tag name
1352    $metatag =~ m/(?:name|http-equiv)\s*=\s*([\"\'])?(.*?)\1/is;
1353    $tag=$2;
1354    # in case they're not using " or ', but they should...
1355    if (! $tag) {
1356        $metatag =~ m/(?:name|http-equiv)\s*=\s*([^\s\>]+)/is;
1357        $tag=$1;
1358    }
1359
1360    if (!defined $tag) {
1361        print $outhandle "HTMLPlugin: can't find NAME in \"$metatag\"\n";
1362        next;
1363    }
1364   
1365    # don't need to assign this field if it was passed in from a previous
1366    # (recursive) plugin
1367    if (defined $metadata->{$tag}) {next}
1368
1369    # find the tag content
1370    $metatag =~ m/content\s*=\s*([\"\'])?(.*?)\1/is;
1371    $value=$2;
1372
1373    if (! $value) {
1374        $metatag =~ m/(?:name|http-equiv)\s*=\s*([^\s\>]+)/is;
1375        $value=$1;
1376    }
1377    if (!defined $value) {
1378        print $outhandle "HTMLPlugin: can't find VALUE in \"$metatag\"\n";
1379        next;
1380    }
1381
1382    # clean up and add
1383    $value =~ s/\s+/ /gs;
1384    chomp($value); # remove trailing \n, if any
1385    if (exists $creator_fields{lc($tag)}) {
1386        # map this value onto greenstone's "Creator" metadata
1387        $tag='Creator';
1388    } elsif (!exists $find_fields{lc($tag)}) {
1389        next; # don't want this tag
1390    } else {
1391        # get the user's preferred capitalisation
1392        $tag = $find_fields{lc($tag)};
1393    }
1394    if (lc($tag) eq "title") {
1395        $found_title = 1;
1396    }
1397    print $outhandle " extracted \"$tag\" metadata \"$value\"\n"
1398        if ($self->{'verbosity'} > 2);
1399    if ($tag =~ m/date.*/i){
1400        $tag = lc($tag);
1401    }
1402    $doc_obj->add_utf8_metadata($section, $tag, $value);
1403
1404    }
1405   
1406    # TITLE: extract the document title
1407    if (exists $find_fields{'title'} && !$found_title) {
1408    # we want a title, and didn't find one in the meta tags
1409    # see if there's a <title> tag
1410    my $title;
1411    my $from = ""; # for debugging output only
1412    if ($html_header =~ m/<title[^>]*>([^<]+)<\/title[^>]*>/is) {
1413        $title = $1;
1414        $from = "<title> tags";
1415    }
1416
1417    if (!defined $title) {
1418        $from = "first 100 chars";
1419        # if no title use first 100 or so characters
1420        $title = $$textref;
1421        $title =~ s/^\xFE\xFF//; # Remove unicode byte order mark       
1422        $title =~ s/^.*?<body>//si;
1423        # ignore javascript!
1424        $title =~ s@<script.*?</script>@ @sig;
1425        $title =~ s/<\/([^>]+)><\1>//g; # (eg) </b><b> - no space
1426        $title =~ s/<[^>]*>/ /g; # remove all HTML tags
1427        $title = substr ($title, 0, 100);
1428        $title =~ s/\s\S*$/.../;
1429    }
1430    $title =~ s/<[^>]*>/ /g; # remove html tags
1431    $title =~ s/&nbsp;/ /g;
1432    $title =~ s/(?:&nbsp;|\xc2\xa0)/ /g; # utf-8 for nbsp...
1433    $title =~ s/\s+/ /gs; # collapse multiple spaces
1434    $title =~ s/^\s*//;   # remove leading spaces
1435    $title =~ s/\s*$//;   # remove trailing spaces
1436
1437    $title =~ s/^$self->{'title_sub'}// if ($self->{'title_sub'});
1438    $title =~ s/^\s+//s; # in case title_sub introduced any...
1439    $doc_obj->add_utf8_metadata ($section, 'Title', $title);
1440    print $outhandle " extracted Title metadata \"$title\" from $from\n"
1441        if ($self->{'verbosity'} > 2);
1442    }
1443   
1444    # add FileFormat metadata
1445    $doc_obj->add_metadata($section,"FileFormat", "HTML");
1446
1447    # Special, for metadata names such as tagH1 - extracts
1448    # the text between the first <H1> and </H1> tags into "H1" metadata.
1449
1450    foreach my $field (keys %find_fields) {
1451    if ($field !~ m/^tag([a-z0-9]+)$/i) {next}
1452    my $tag = $1;
1453    if ($$textref =~ m@<$tag[^>]*>(.*?)</$tag[^>]*>@g) {
1454        my $content = $1;
1455        $content =~ s/&nbsp;/ /g;
1456        $content =~ s/<[^>]*>/ /g;
1457        $content =~ s/^\s+//;
1458        $content =~ s/\s+$//;
1459        $content =~ s/\s+/ /gs;
1460        if ($content) {
1461        $tag=$find_fields{"tag$tag"}; # get the user's capitalisation
1462        $tag =~ s/^tag//i;
1463        $doc_obj->add_utf8_metadata ($section, $tag, $content);
1464        print $outhandle " extracted \"$tag\" metadata \"$content\"\n"
1465            if ($self->{'verbosity'} > 2);
1466        }
1467    }
1468    }   
1469}
1470
1471
1472# evaluate any "../" to next directory up
1473# evaluate any "./" as here
1474sub eval_dir_dots {
1475    my $self = shift (@_);
1476    my ($filename) = @_;
1477    my $dirsep_os = &util::get_os_dirsep();
1478    my @dirsep = split(/$dirsep_os/,$filename);
1479
1480    my @eval_dirs = ();
1481    foreach my $d (@dirsep) {
1482    if ($d eq "..") {
1483        pop(@eval_dirs);
1484       
1485    } elsif ($d eq ".") {
1486        # do nothing!
1487
1488    } else {
1489        push(@eval_dirs,$d);
1490    }
1491    }
1492
1493    # Need to fiddle with number of elements in @eval_dirs if the
1494    # first one is the empty string.  This is because of a
1495    # modification to util::filename_cat that supresses the addition
1496    # of a leading '/' character (or \ if windows) (intended to help
1497    # filename cat with relative paths) if the first entry in the
1498    # array is the empty string.  Making the array start with *two*
1499    # empty strings is a way to defeat this "smart" option.
1500    #
1501    if (scalar(@eval_dirs) > 0) {
1502    if ($eval_dirs[0] eq ""){
1503        unshift(@eval_dirs,"");
1504    }
1505    }
1506   
1507    my $evaluated_filename = (scalar @eval_dirs > 0) ? &util::filename_cat(@eval_dirs) : "";
1508    return $evaluated_filename;
1509}
1510
1511sub replace_usemap_links {
1512    my $self = shift (@_);
1513    my ($front, $link, $back) = @_;
1514
1515    # remove quotes from link at start and end if necessary
1516    if ($link=~/^[\"\']/) {
1517    $link=~s/^[\"\']//;
1518    $link=~s/[\"\']$//;
1519    $front.='"';
1520    $back="\"$back";
1521    }
1522
1523    $link =~ s/^\.\///;
1524    return $front . $link . $back;
1525}
1526
1527sub inc_filecount {
1528    my $self = shift (@_);
1529
1530    if ($self->{'file_num'} == 1000) {
1531    $self->{'dir_num'} ++;
1532    $self->{'file_num'} = 0;
1533    } else {
1534    $self->{'file_num'} ++;
1535    }
1536}
1537
1538
1539# Extend read_file so that strings like &eacute; are
1540# converted to UTF8 internally. 
1541#
1542# We don't convert &lt; or &gt; or &amp; or &quot; in case
1543# they interfere with the GML files
1544
1545sub read_file {
1546    my $self = shift(@_);
1547    my ($filename, $encoding, $language, $textref) = @_;
1548
1549    $self->SUPER::read_file($filename, $encoding, $language, $textref);
1550
1551    # Convert entities to their UTF8 equivalents
1552    $$textref =~ s/&(lt|gt|amp|quot|nbsp);/&z$1;/go;
1553    $$textref =~ s/&([^;]+);/&ghtml::getcharequiv($1,1)/gseo;
1554    $$textref =~ s/&z(lt|gt|amp|quot|nbsp);/&$1;/go;
1555}
1556
15571;
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